#include <iostream>
#include <opencv2/highgui/highgui.hpp>

int main(int argc, char const *argv[]) {
    const std::string name = "lena";
    const std::string img = "lena.png";
    cv::Mat img_src = cv::imread(img);
    if (img_src.empty()) {
        std::cout << "no input img" << '\n';
        return -1;
    }
    cv::namedWindow(name);
    cv::imshow(name,img_src);
    cv::waitKey(0);
    return 0;
}
